Is there a way to gauge the age of a chicken? We took in three laying hens recently, the age unknown to us, but the conditions deplorable (pecked somewhat featherless and raw). Two of the hens are doing fine, but one seems to be slowing down over the last few days. She'll fall asleep standing up, and was very slow to go into the coop tonight, walking just through the door and then slowly lying down. My dh noticed her crop is enlarged and is a little concerned it has to do with some grass clippings he put in the run the other day. We will check that out in the morning, though, to make sure it's come down. Any tips to tell how old a chicken is?